An irate Van Wagenen assembled manager Mickey Callaway and the coaching staff in the coaches’ room immediately after the game, according to a source, and lashed out at the individuals present — bemoaning the fact Jacob deGrom’s strong performance had been wasted. Accompanying Van Wagenen at the meeting was assistant GM Allard Baird.

After ripping the coaches, according to a source, the usually mild-mannered Van Wagenen picked up a chair and threw it and told Callaway to go conduct his “f--king press conference.” Callaway provided no hint that anything was amiss as he met with reporters following the loss.

Van Wagenen would not confirm or deny the incident when reached by phone Saturday, according to The Post. The Mets are playing a night game, so Callaway will certainly be asked after. The Mets entered Saturday’s game against the Phillies 10 games under .500 at 39-49. They are 12 games back in the loss column of the Braves for the National League East lead and are seven games back in the loss column for the second wild card playoff spot in the league.